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lxdream.org :: lxdream/src/pvr2/scene.h
lxdream 0.9.1
released Jun 29
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filename src/pvr2/scene.h
changeset 687:6bdc2b7032ea
prev669:ab344e42bca9
next736:a02d1475ccfd
author nkeynes
date Sat Jun 14 11:54:15 2008 +0000 (12 years ago)
permissions -rw-r--r--
last change Change colour params to float
Convert background processing over to scene structure (fixes some depth issues as well)
Add color unclamp when supported
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     1 /**
     2  * $Id$
     3  *
     4  * PVR2 rendering functions (private)
     5  *
     6  * Copyright (c) 2005 Nathan Keynes.
     7  *
     8  * This program is free software; you can redistribute it and/or modify
     9  * it under the terms of the GNU General Public License as published by
    10  * the Free Software Foundation; either version 2 of the License, or
    11  * (at your option) any later version.
    12  *
    13  * This program is distributed in the hope that it will be useful,
    14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    16  * GNU General Public License for more details.
    17  */
    19 #ifndef lxdream_render_H
    20 #define lxdream_render_H 1
    22 /************************* Intermediate vertex buffer ************************/
    24 typedef enum { 
    25     SORT_NEVER = 0, 
    26     SORT_TILEFLAG = 1, /* In this mode, sorting is controlled by the per-segment flag */
    27     SORT_ALWAYS = 2 
    28 } tile_sort_mode_t;
    30 struct vertex_struct {
    31     float u,v;
    32     float x,y,z;
    33     float rgba[4];
    34     float offset_rgba[4];
    35 };
    37 struct polygon_struct {
    38     uint32_t *context;
    39     int cull;             // culling mode
    40     uint32_t vertex_count; // number of vertexes in polygon
    41     uint32_t tex_id;
    42     int32_t vertex_index; // index of first vertex in vertex buffer
    43     uint32_t mod_tex_id;
    44     int32_t mod_vertex_index; // index of first modified vertex in vertex buffer
    45     float center_z;
    46     struct polygon_struct *next; // chain for tri/quad arrays
    47 };
    49 void pvr2_scene_init(void);
    50 void pvr2_scene_read(void);
    51 void pvr2_scene_shutdown();
    53 uint32_t pvr2_scene_buffer_width();
    54 uint32_t pvr2_scene_buffer_height();
    56 extern unsigned char *video_base;
    58 /**
    59  * Maximum possible size of the vertex buffer. This is figured as follows:
    60  * PVR2 polygon buffer is limited to 4MB. The tightest polygon format 
    61  * is 3 vertexes in 48 bytes = 16 bytes/vertex, (shadow triangle) 
    62  * (the next tightest is 8 vertex in 140 bytes (6-strip colour-only)).
    63  * giving a theoretical maximum of 262144 vertexes.
    64  * The expanded structure is 44 bytes/vertex, giving 
    65  * 11534336 bytes...
    66  */
    67 #define MAX_VERTEXES 262144
    68 #define MAX_VERTEX_BUFFER_SIZE (MAX_VERTEXES*sizeof(struct vertex_struct))
    70 /**
    71  * Maximum polygons - smallest is 1 polygon in 48 bytes, giving
    72  * 87381, plus 1 for the background
    73  * 
    74  */
    75 #define MAX_POLYGONS 87382
    76 #define MAX_POLY_BUFFER_SIZE (MAX_POLYGONS*sizeof(struct polygon_struct))
    77 #define BUF_POLY_MAP_SIZE (4 MB)
    79 /*************************************************************************/
    81 /* Scene data - this structure holds all the intermediate data used during
    82  * the rendering process. 
    83  *
    84  * Special note: if vbo_supported == FALSE, then vertex_array points to a
    85  * malloced chunk of system RAM. Otherwise, vertex_array will be either NULL
    86  * (if the VBO is unmapped), or a pointer into a chunk of GL managed RAM
    87  * (possibly direct-mapped VRAM).
    88  */
    89 struct pvr2_scene_struct {
    90     /** GL ID of the VBO used by the scene (or 0 if VBOs are not in use). */
    91     GLuint vbo_id;
    92     /** Pointer to the vertex array data, or NULL for unmapped VBOs */
    93     struct vertex_struct *vertex_array;
    94     /** Current allocated size (in bytes) of the vertex array */
    95     uint32_t vertex_array_size;
    96     /** Total number of vertexes in the scene (note modified vertexes
    97      * count for 2 vertexes */
    98     uint32_t vertex_count;
   100     /** Pointer to the polygon data for the scene (main ram). 
   101      * This will always have room for at least MAX_POLYGONS */
   102     struct polygon_struct *poly_array;
   103     /** Pointer to the background polygon. This is always a quad, and
   104      * normally the last member of poly_array */
   105     struct polygon_struct *bkgnd_poly;
   106     /** Total number of polygons in the scene */
   107     uint32_t poly_count;
   109     /** Image bounds in 3D - x1,x2,y1,y2,z1,z2 
   110      * x and y values are determined by the clip planes, while z values are
   111      * determined from the vertex data itself.
   112      */
   113     float bounds[6];
   115     /* Total size of the image buffer, determined by the tile map used to
   116      * render the scene */
   117     uint32_t buffer_width, buffer_height;
   119     /** True if modifier volumes use the two-parameter form, False if they
   120      * use the cheap-shadow option.
   121      */
   122     gboolean full_shadow;
   123     /** Specifies the translucency auto-sort mode for the scene */
   124     tile_sort_mode_t sort_mode;
   126     /** Pointer to the start of the tile segment list in PVR2 VRAM (32-bit) */
   127     struct tile_segment *segment_list;
   128     /** Map from PVR2 polygon address to an element of poly_array. */
   129     struct polygon_struct **buf_to_poly_map;
   130     /** Pointer to the start of the raw polygon buffer in PVR2 VRAM (32-bit).
   131      * Also only used during parsing */
   132     uint32_t *pvr2_pbuf;
   133     /** Current vertex index during parsing */
   134     uint32_t vertex_index;
   135 };
   137 /**
   138  * Current scene structure. Note this should only be written to by vertex bufer
   139  * functions
   140  */
   141 extern struct pvr2_scene_struct pvr2_scene;
   144 #endif /* !lxdream_render_H */
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